From ChangeLog:
From ChangeLog:

: 2002-10-14  Werner LEMBERG  <wl@gnu.org>
:
: 	* src/roff/troff/node.cc (troff_output_file::put_char_width,
: 	troff_output_file::put_char, troff_output_file::fill_color,
: 	troff_output_file::glyph_color): Handle case where color pointer
: 	is null.

This paniced troff(1) attempting to format the vinum(4) manpage.

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